Abstract

The purpose of the present study was to describe normal magnetic resonance (MR) imaging anatomy of theequine larynx and pharynx and to present the optimal protocol, sequences, and possible limitations of thisexamination technique. Using a 0.3T unit, the laryngeal and pharyngeal regions was imaged in two horses. Theprotocol consisted of sagittal and transverse T2-weighted (T2w) fast spin echo, transverse T1-weighted (T1w)spin echo, and dorsal high-resolution T1w gradient echo (both pre- and postcontrast enhancement) sequences.Euthanasia was performed at the end of the imaging procedure. Macroscopic anatomy of the cadaver sectionswere compared with the MR images in transverse, midsagittal, and parasagittal planes. There was gooddifferentiation of anatomic structures, including soft tissues. The laryngeal cartilages, hyoid apparatus, andupper airway muscle groups with their attachments could be clearly identified. However, it was not alwayspossible to delineate individual muscles in each plane.Most useful were both T2w and T1w transverse sequences.Intravenous application of contrast medium was helpful to identify blood vessels. The MR images correspondedwith the macroscopic anatomy of cadaver sections.

Abstract

The purpose of the present study was to describe normal magnetic resonance (MR) imaging anatomy of theequine larynx and pharynx and to present the optimal protocol, sequences, and possible limitations of thisexamination technique. Using a 0.3T unit, the laryngeal and pharyngeal regions was imaged in two horses. Theprotocol consisted of sagittal and transverse T2-weighted (T2w) fast spin echo, transverse T1-weighted (T1w)spin echo, and dorsal high-resolution T1w gradient echo (both pre- and postcontrast enhancement) sequences.Euthanasia was performed at the end of the imaging procedure. Macroscopic anatomy of the cadaver sectionswere compared with the MR images in transverse, midsagittal, and parasagittal planes. There was gooddifferentiation of anatomic structures, including soft tissues. The laryngeal cartilages, hyoid apparatus, andupper airway muscle groups with their attachments could be clearly identified. However, it was not alwayspossible to delineate individual muscles in each plane.Most useful were both T2w and T1w transverse sequences.Intravenous application of contrast medium was helpful to identify blood vessels. The MR images correspondedwith the macroscopic anatomy of cadaver sections.

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